package 回溯;
//https://leetcode.cn/problems/letter-combinations-of-a-phone-number/
import java.util.ArrayList;
import java.util.List;

public class 电话号码的字母组合 {
    public List<String> letterCombinations(String digits) {
        List list = new ArrayList();
        if (digits == null){
            return list;
        }
        return list;
    }
}
